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Gloucestershire coroner Katy Skerrett said there was no evidence to show how Mr Bleszynski met his death and she recorded an open conclusion.

The inquest was told he had always seemed "entirely well" until 2011 when he was suspended from GCHQ because of an unspecified incident at work.

After that he suffered anxiety and depression and sought help from a psychiatrist.

He always seemed to suffer from anxiety and depression

Joanna Bleszynski

He was re-instated at work but then left his GCHQ employment during 2012.

He lived alone in a flat in Lloyd Close, Cheltenham, and remained unemployed at the time of his death.

It was on April 17 that his decomposed body was found in the bath of his neat and tidy flat.

Consultant pathologist Dr John McCarthy, who carried out a post mortem, told the inquest that the condition of Mr Bleszynski's lungs was consistent with death by drowning.

"I found no disease processes or trauma that could have had any bearing on his death," he said. "There were no injuries that I could find externally, or to the brain.

"There is nothing to account for his drowning apart from a sudden collapse in the bath or that he may have self-submerged in order to inhale water."

GETTY

Tomas Bleszynski was re-instated at work but then left his GCHQ employment during 2012

He said it was difficult to say how long he had been in the water, but he estimated about two or three weeks.

A toxicology report showed Mr Bleszynski had not been taking his regular medication for anxiety prior to his death, and this was something he was normally very precise about.

The inquest heard that his parents, Joanna and Viktor Bleszynski, travelled down from their home in Nottingham on April 17 because they had been unable to contact their son for some time.

Mrs Bleszynski told the coroner that her son had seemed entirely well until 2011, when he had been suspended from work at GCHQ due to an "incident".

"He always seemed to suffer from anxiety and depression," she went on, "and I was aware that he had been seeing a psychiatrist. He told me he was doing his best trying to get better."

Mr Bleszynski was reinstated at work she said, but in the summer of 2012, he left again.

She said he wanted to stay in the Cheltenham area because there was more chance of finding another job, and he regularly applied for posts in the area.

When she last saw him in February 2015, he appeared completely normal, and she and her husband spent the day with him at his flat.

He texted her on March 26 and that was the last time she heard from him.

When Mr Bleszynski's parents went to Cheltenham on April 17, there was no response from his phone or from the door and they called police.

Officers found that the flat door had been left unlocked - something which Mr Bleszynski would never normally have done.

He was found face down in a bath full of water, and the coroner estimated that he had probably died at the end of March.

The greatest spies in history

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Espionage can be a dangerous game and we have rounded up the best spies in history. Some being real spies whilst others are fictional and some of those fictional characters where thought up by real spy's.